When you have reverse cowgirl anal sex with a girl who has nasty, gross beer shits from the night previous. While having said reverse cowgirl anal sex, the girl jumps off your dick, shits on your chest, and slides on the fecal matter right back onto your dick.

"Dude, I hooked up with this really hot chick at the party last night and we had some morning after sex but she totally gave me the Dublin Mudslide. I cried... for hours."
"br00tuhl..."